Issue #298: Kallithea fails to start after Lubuntu upgrade. (conservancy/kallithea)

[BGW]

New issue 298: Kallithea fails to start after Lubuntu upgrade.
https://bitbucket.org/conservancy/kallithea/issues/298/kallithea-fails-to-start-after-lubuntu

BGW:

I've been using Kallithea for some weeks now. Quite successfully. 

Today I updated and restarted my Lubuntu SCM machine. When I tried to restart Kallithea this happened:


```
#!sh

scm at scm:~/kallithea$ virtualenv ../kallithea-venv
Running virtualenv with interpreter /usr/bin/python2
New python executable in /home/scm/kallithea-venv/bin/python2
Not overwriting existing python script /home/scm/kallithea-venv/bin/python (you must use /home/scm/kallithea-venv/bin/python2)
Installing setuptools, pkg_resources, pip, wheel...done.
```


After this nothing worked. What do I need to do here to get Kallithea working?